Printing plate and block



(No Model.)

anno-MAN.'

PRINTING PLATE'AND BLOUK.

No. 478,749. Patented July 12, 1892..

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UNITED STATES PATENT OFFICE.

STEPHEN H. HORGAN, OF JERSEY CITY, NEI/V JERSEY.

PRINTING PLATE AND BLOCK.

SPECIFICATION forming part of Letters Patent No. 478,749, dated July 12,1892.

Application tiled November 28, 1887. Serial No. 256,288. (No model.)

.To all whom it may concern: Beit known that I, STEPHEN H. HOEGAN, ofJersey City, in the county of Hudson and State of New Jersey, haveinvented a certain new and useful Improvement in Printing Plates andBlocks, of which the following is a specification.

I will describe the improvement in detail and point out the novelfeatures in claims.

In the accompanying drawings, Figures 1, 2, 3, and 4 are perspectiveviews of printingblocks embodying my improvement, and Fig. 5 is asectional view of a printing-block also embodying my improvement andintended to show my improvement as applied to a printing-block widerthan a single column.

Similar letters of reference designate corresponding parts in all thefigures. A designates a printing plate or shell. It may be made of anysuitable material-as for instance, type-metal, aluminium, celluloid, orvulcanized rubber. The base for the printing plate or shell is shown asmade in two portions B C. lYhere a plate or shell of heavymaterial-such, for instance, as type-metalis employed, the portion B ofthe base may be provided with a groove, into which one of the tracks aof the plate or shell may fit. (See Fig. l.) If, however, the plate orshell be made of light or flexible material-such, for instance, asvulcanized rubber or celluloidit may be found desirable to makeadditional provision for holding the plate or shell down to the base,and in Fig. 2 I have shown the portion B of the base as provided withother grooves, into which projections, as b c, on the plate or shell maybe fitted. The portion C of the base may beprovided at or near its upperouter end with a track or groove, and a portion of the plate or shell Amay be so shaped as to tit into this track or groove. The base B C willpreferably be made slightly wider than the plate or shell A, so that thecolumnrules will not press on the plate or shell when in the type-form.Of course the base may be made in three or even more pieces, and the Ytwo side portions of the base might be formed like the portion C. If forany reason the plate or shell should work loose on the base B C, allthat would be necessary to remedy the defect would be to insert a striph, Fig. 2,

of paper or other material of proper size and thickness, between theparts B and C.

It may be found desirable in some cases to provide means for soconnecting the portions B C of the base that they will notslip. To thisend in Fig. 3 I have shown a projection?l in one portion, as B, fittinginto a corresponding recess on the other portion, as C. T he portion Cof the base may taper or flare 1nwardly at the upper end of the sidenext to the portion B, as shown at Z in Fig. 4. .In such case a suitablespace for this tapering or flaring portion should be left in the portionB of the base.

In Fig. 5 I have shown myinvention as applied where the plate or shellis made in one piece to cover more than one column. In such case allthat is necessary is to fill the space ordinarily occupied by thecolumn-rule with slugs or brass rules m.

In practice I prefer to make the plate or shell so that when it isapplied to the base the base and plate or shell will t tightly evenbefore lateral pressure is applied to the base, and hence when the baseis placed in position between the column-rules and lateral pressure isapplied thereto the plate or shell will be held tightly upon the base,thereby obviating the objectionable springing upward of the plate orshell on the loosening of the plate or shell. This base further suppliesan upper surface upon which the plate or shell may rest and enables theplate or shell to stand pressure during printing better than 1f theplate or shellA possessed feet. I am enabled by my improvement to employa very light and thin printing plate or shell in a very satisfactorymanner.

What I claim as my invention, and desire to secure by Letters Patent, is

1. The combination of a plate or shell having depending side flanges anda base therefor made in two unequal portions, each of said portionshaving a groove at its upper outer edge, substantially as specified.

2. As a new article of manufacture,a printing plate or shell madeseparate from and independent of the base to which it is intended to beapplied, said plate or shell having its parts of greatest thickness atits extreme sides, said parts of greatest thickness pro- IOO jectingdown from the under surface of the grooves at its outer sides, intoWhich the deplate or shell and having recesses in the inpending sideIianges of the plate or shell will ner sides of said side projections,said plate it, and said base having other grooves in its or shell havingother projections on its under upper surface, into which the projectionson I5 5 surface adapted to tit into recesses in the base the undersurface of the plate or shell will to which it is intended to beapplied, subfit, substantially as specified. stantially as specified. fl v 3. The combination of a plate or shell hav- S FEPHEN H' MORGAN' ingdepending side anges and projections on Witnesses:

1o its under surface `with a base therefor made JOSEPH T. MOCOOBERY,

in more than one piece, said base having ROBERT E. MCCOOBERY.

